Geared die-stock.



H. W. OSTER.

GEARED DIE STOCK.

APPLICATION FILLED FEB. 28, 1907.

Patented June 15, 1909.

3 SHEETS-32 21 1. I

H. W. OSTER.

GEARED DIE STOCK. AJPLIOATIQN FILED 1'23. 28, 1907.

925 ,220. Pa-tented June. 15, 1909.

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"HI-i H. W. OSTER.

GEABED DIE STOCK.

APPLICATION nun FEB. 28.1907.

Patented June 15, 1909.

3 SHEETS-SHEET 3.

UNITED STATES PATEN T OFFICE.

HERMAN W. OSTER, OF CLEVELAND, OHIO, ASSIGNOR TO THE OSTER MANUFACTURINGCOMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

'GEARED DIE-STOCK.

Specification of Letters Patent.

Patented June 15, 1909.

To all whom it may concern:

Be it known that I, HERMAN W. Osrna, a citizen of the United States,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented a certain new and useful Improvement in Geared Die- Stocks, ofwhich the following is a full, clear, and exact description.

The object of this invention is to provide a machine, especially adaptedfor threading large pipes, which may be easily disengaged from a pipeafter the threads have been cut thereon without being obliged to turnthe mechanism backward to unscrew it.

The invention includes a body capable of holding the pipe which is to bethreaded, a cutter head capable of turning and of moving endwise uponsaid body,these parts being respectively provided with lead threads andwith movable devices having threads for engagement with said leadthreads,means being provided for holding said devices in operativeposition and for automatically moving them out of operative positionafter the cutter head has moved a predetermined distance upon the body,lengthwise thereof.

The invention includes the combination of parts above mentioned as wellas more specific combinations of parts contained in the embodiment ofthe invention, as shown in the drawing, all of which is hereinafterdescribed and definitely pointed out in the claims.

In the drawings, Figure 1 is an end view, with some of the parts brokenaway and sectioned, of a geared die stock embodying the invention. Fig.2 is a central longitudinal section thereof. 3 is a sectional view onthe line 33 of Fig. 2. Fig. 4 is a side view partly sectioned of a partof said die stock.

Referring in detail to the parts of the enrbodiment of the inventionshown in the drawings, 1 represents the body of the device. It includesa cylindrical barrel 2, and a bearing 3, suitably connected therewith,for the operating shaft 1,said shaft being provided with a long pinion5.

6 represents the cutter head having a cylindrical sleeve-like extension7 which is rotatably mounted upon the barrel 2 of the body. The head 6carries the radially movable chasers or thread cutting dies 8; and anysuitable mechanism for moving them into and out of working position maybe provided. The means shown for this purpose are of familiarconstruction, consisting of a plate 9 rotatively held upon the end ofthe head, and provided with cam ribs 10 which engage in notches 11 inthe edges of the chasers. A gear 12 is fitted upon this cutter headsleeve 7, embracing an annular flange 13 thereon. A key 14 connects thissleeve 7 and gear together and thereby compels them to rotate in unisonbut permits them to move endwise relatively to each other. The gear isprovided with an annular shoulder 15, which is opposed to one side ofsaid flange 13, and is adapted to engage therewith so as to limit therelative endwise movement of the gear and sleeve in one direction. Aring 16 embraces the sleeve on the opposite side of this flange 13 andis securely fastened to the hub of the gear. It is adapted to engagewith said flange and thereby limit the relative motion of the sleeve andgear in the other direction.

On the outer periphery of the barrel 2 lead threads 17 are cut, and theyare adapted to be engaged by the threaded faces of levers 18. Theselevers lie and are pivoted in slots 19 in a sleeve 20 which is rigidlyconnected with the gear 1.2. This lever 18 has at its outer end an.outwardly extended enlargement 21 having a beveled face 22; and saidlever has at its other end, i. e. on the oppo site side of its pivot, anoutwardly extended tail piece 23. A floating ring '24.- embraces theselevers, and, when in the position shown in Fig. 2, engages with theouter surfaces of the projections 21, and thereby holds the lovers inengagement with the lead threads 17. There are several rods 25 lyingparallel with the aXis of the body and head, and passing loosely throughholes in the hub of the gear 12, and occupying such positions that theymay engage with one end of this floating ring. In the body is a shoulder26 with which the other end ofthis floating ring may engage. Secured inthe body are blocks 27 arranged so that they will be engaged by the gear12, when the gear is in the position it should occupy when the device isready to begin to thread a pipe. I

In operating the device, the pipe to be threaded is passed through theend of'the body toward and into engagement with the chasers, and is madefast to the body and properly centered by screws 29. Then, by means of acrank, not shown, to be attached to shaft 4, this shaft is turned. Theresult is that gear 12 and the cutter The engagement of the levers 18with the lead threads 17 draws the head inv. ard along the barrel of thebody at the proper rate, and the chase-rs begin to cut the threads uponthe pipe. This cutter head is so draw. 11 along as 1t rotates, until thethreads on the pipe have been well started and until. threads on levers18 run off of the lead screw threads 17 on the barrel The chascrs havenow out such a thread upon the pipe that as the cutter head is furtherturned these chasers will cause the head to properly move lengthwise ofthe pipe being threaded. After the levers 18 run off the lead screwthreads 17, the lengthwise movement of the car 12 'll be temporarilydiscontinued, but said movc ment of the cutter head will continue untilthe flange 13 comes in contact with shoulder 15. Thereafter the gear itill also move lengthwise with the cutter head. After a suitable period,and when the thread on th. pipe is nearly as long as required, thefloating ring 24, which has been moving along ith the gear and thelevers 18, will st ike agarist shoulder 26 and will be stopped. The continued movement of the cutter head and gear will carry these leversalong until the tail pieces 23 thereon engage {xlhll the rear end of thefloating ring, and thereby the levers are thrown outward, therebycarrying their threads out of range of the lead threads 17 on thebarrel. The cutting of the thread on the pipe will now be substantiallycomplete.

In order to move the device from the threaded pipe without having toscrew it backward, the chasers are drawn outward by the action of thecam ring 9. The operator now takes hold of the cutter head, and pulls itout. The flange 13 will engage with the ring 16 and will pull the gearalong with it until it is stopped by blocks 2. This will draw the levers18 backward and the floating ring will go with them. The cutter head isthen pushed inward a short distance. It will strike the ends of the rods25 and will push them inward and they will push the floating ringinward. This ring, by engaging with the inclines 22 on levers 18, willswing said levers inward and cause their screw threads to engage withthe lead screw threads 17. The cutter head is then drawn back to theposition shown in Fig. 2, and the device is in readiness tooperate onanother pipe to thread the same. The handles 40 are attached to the bodyand afford convenient means by which the die stock may be lifted andcarried from one place to another.

At the left side and near the top of Fig. 1 are shown some parts whichhave nothing to do with the invention herein claimed. They are valuablepractical adjuncts of a machine in which the present invention is headare turned. l embodied; but they might be omitted withi out affectingthe operation of the invention herein defined by the claims.

Referring to these parts 42 represents a lever which is pivoted. to ancar on the cam plate 9. A toe of this lever is adapted to enter eithernotch 43 in a plate 44 which is adjustably secured to the head 6 bybolts 45. There are two of these notches 43 in the plate 44, as

shown,the toe of the lever being in the one indicated by dotted lines.There may, how ever, be as many of these notches as desired. This plate44 is adjusted on the head until it reaches such a position that whenthe toe of lever 42 is in one of these notches the cam plate 9 will bein that position which will hold the dies 8 in the proper position tocut threads on the particular pipe upon which they are to be out. Afterthe thread is cut the dies may be withdrawn from the threaded pipe byswinging lever 42 outward so as to disengage its tee from the notch 43,and then turning the cam plate. To set the cam plate so that the deviceis ready to cut threads on another plate of the same diameter, the camplate, when turned to the proper position, is there locked by theengagement of the toe of lever 42 with a notch 43. It will be understoodthat there are slots in plate 44 whereby it may be moved upon bolts 45,which bolts, when the plate has been moved to the proper position, clampit firmly against the head.

Having described my invention, 1 claim:

1. The combination of a body having means for holding the pipe to bethreaded, a cutter head which is rotatively mounted upon said body andis capable of being movedv lengthwise thereof, said body and die stockbeing respectively provided with lead threads and with a movablethreaded device for engagement with said lead threads, a 1011-gitudinally movable member for holding said device in operativeposition, and means which, after the cutter head has moved a definitedistance relative to the body, will engage with said member and move itaway from the position in which it so holds said threaded device.

2. The combination of a body having a cylindrical barrel whereon areexternal lead threads, a cutter head having a cylindrical sleevewhich isrotatively mounted upon said barrel, a gear non-rotatively secured uponsaid sleeve, a long pinion rotatably mounted in the body engaging withsaid gear, levers carried by said gear and having threaded faces forengaging with said lead threads, means for holding said levers inoperative position, and means which are caused to operate by the endwisemovement of the cutter head relative to the body for moving said holdingmeans away from the holding posi tion.

3. The combination of a body having a cylindrical barrel whereon areexternal lead threads, a cutter head having a cylindrical sleeve whichis fitted upon said barrel, means for rotating said sleeve, deviceshaving threaded faces adapted to engage with said lead threads,whichdevices are movably connected with said cutter head, means for holdingsaid devices in operative position for engagement with said leadthreads, and means which are caused to operate by a definitelongitudinal movement of the cutter head relative to the body forpositively withdrawing said threaded devices from engagement with thelead threads.

4. The combination of a body having a cylindrical barrel whereon areexternal lead threads, a cutter head having a cylindrical sleeve whichis fitted upon said barrel, pivoted levers carried by said sleeve andhaving threaded faces adapted to engage with said lead threads, a ringwhich embraces all of said levers and normally holds them in operativeposition, a shoulder upon the body adapted to be engaged by said ringafter it has moved a definite distance lengthwise of the body, saidlevers having tail pieces projecting into the plane of said ring andadapted to be engaged thereby after the ring has been stopped throughengaging with said shoulder.

5. The combination of a body having a cylindrical barrel whereon areexternal lead threads, a cutter head having a cylindrical sleeve whichis fitted upon said barrel, a gear non-rotatively mounted upon saidsleeve but capable of a limited longitudinal motion thereon, means onthe sleeve for limiting said motion, levers pivoted to a part of saidgear, each of which levers has a threaded face for engaging with saidlead threads and a tail piece, a floating ring embracing all of saidlevers and adapted to hold them in operative position, a shoulder on thebody adapted to be engaged by said ring to stop endwise movement,whereby, as said cutter head and sleeve continue their endwise movement,the tail piece of said levers are brought into engagement with said ringand the levers there by withdrawn to inoperative positions.

6. The combination of a body having a cylindrical barrel whereon areexternal lead threads, a cutter head having a cylindrical sleeve whichis fitted upon said barrel, a gear non-rotatively mounted upon saidsleeve but capable of a limited longitudinal motion thereon, means 011the sleeve for limiting said motion, levers pivoted to a part of saidgear, each of which levers has a threaded face for engaging with saidlead threads, and a tail piece, a floating ring embracing all of saidlevers and adapted to hold them in operative position, a shoulder on thebody adapted to be engaged by said ring and to prevent it from movingendwise, whereby, as said die stock and sleeve continue their endwisemovement, the tail pieces of said levers are brought into engagementwith said ring and the levers thereby withdrawn to inoperativepositions, rods movably mounted in the hub of said gear in positions toengage the end of said ring and part of the cutter head.

7. The combination of a body having a eylindrical barrel whereon areexternal lead threads, a shaft mounted in said body with its axisparallel With the axis of the barrel and having a long pinion, a cutterhead having a sleeve which is movably mounted upon said barrel, saidsleeve having an external annular flange, a gear fitted upon said flangeand keyed to said barrel, annular shoulders carried by said gear andlocated 011 opposite sides of said flange, levers pivoted to a part ofsaid gear and having lead threads on their inner faces near one end andhaving, outside of said threaded faces, inclined projections and havingon the opposite sides of their pivots outwardly extended tail pieces, afloating ring embracing said levers and engaging the said bosses,whereby said levers are held in operative positions, a shoulder on thebody adapted to be engaged by said ring, and rods mounted in holes inthe hub of said gear and lying parallel with the axis thereof andmovable lengthwise, said rods being located in planes where their frontends will be opposed to the ends of the floating ring and their rearends opposed to a part of the cutter head.

In testimony whereof, I hereunto affix my signature in the presence oftwo witnesses.

HERMAN W. OSTER.

Witnesses:

E. B. GrLonRrsT, E. L. THURSTON.

